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- H. MITCHELL.

LEVERDERRIGK. No. 290,786. I Patented Dec; 25. 1883.

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-0. H. MITOHELL. LEVER DERRICK. No. 290,786. Patented Dec. 25, 1883.

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(No Model.) 3 Sheets-Sheet 3.

0. H. MITCHELL.

LEVER'DERRIGK.

NITED TATEES FFICE.

PATENT LEVER-DERRICK.

' SPECIFICATION forming part of Letters Patent No. 290,786, dated December 25, 1883.

' Application filed June 29, 1883. (N0 model.)

To all whom it may concern.-

Be it known that 1. 013m) H. MITCHELL, a citizen oftheUnited States, residing at Springfield, in the county of Greene and State of Missouri, have invented certain new and useful Improvements in Lever-Derricks, of which the following is a specification, reference being had therein to the accompanying drawings.

My invention relates to improvements on my former patent in lever-derricks, dated July 17, A. D. 1883, patent numbered 281,639, to Obed H. Mitchell, of Springfield, State of Missouri. The object of this improvement is to support and strengthen the lever, to make the derrick more useful, more easily managed, and more convenient for moving from place to place. These objects I attain by means of the device illustrated in the accompanying drawings, in which- Figure 7 is a view showing the entire device. Fig. 9 is a view showing the old derrick. The other figures are detailed views. Fig. 1 shows the improved lever; Fig. 6, the old lever; Fig. 2, a cap for the end of the lever; Fig. 3, a support for the bridge; Figs. 4 and 5, guy-rods and extended pivot-pin, and Fig. 8 a swiveled clevis and ring.

A is a cap for the end of the lever F, the end being made square, as shown in Fig. 1. The cap is made of iron or other suitable material, with pieces b", to prevent the end of the lever from splitting, and with ears a, Fig. 2, through which the guy-rods D D pass.

D? are guy-rods. They are made with a ring or hook, (1*, at one end, Fig. 5, and threads for a nut, cl, at the other. These guy-rods D are to prevent the lever from bending sidewise, being placed on each side, as shown in Fig.1. The ring or hook d is placed over the end of the extended pivot-pin t, Fig. 4. The rods D are adjusted in length by means of the nut 62, where they pass through the cap A. The pivot-bolt, t, of the former derrick, Fig. 6, is made longer at t, Figs. 1 and 4, and with shoulders t i any convenient distance from the lever, to support the inner ends of the guyrods D B are supports, through which the guy-rods pass, made in the shape of an elbow and placed at convenient distances from the pivot-pin,and bolted directly opposite to each other, as

shown in Fig. 7. These prevent the lever from twisting.

B B are supports ofthe bridge Fig. 1, being made of one piece of iron bent up at the ends ff, Fig. 3. c are holes for bolting them to the lever F. The holes 0' are for the'bridgerod 9 to pass through. The outer ends of the ll ridgerod are attached to the hooked bolts i,

ig. l.

K is a swiveled clevis and ring, (shown in Fig. 8,) with a roller, IC. The clevis K is attached to the ring K by the swivel K. This swiveled clevis is used upon the stay-circle D D of my former derrick, Fig. 9, in the place of the compound ring 2. The roller K is to facilitate the motion from side to side. The rope 'i, Fig. 9, may be wound around the ring, as shown at i, Fig. 8, the free end being used by the operator to create friction on the ring. When the front end of the lever is raised to the desired height, the operator can then move the end of the lever to the desired position, and then gradually lower it to any point for unloading.

The stay-circle D D, Fig. 9, of the old derrick I make smaller than D", Fig. 7, and attach it to the standard B by bolts d Fig. 7, extending through the standard. The holes for the bolts d are so made that the stay-circle D may be changed to the opposite side of the standard.

In using the smaller stay-circle, D Fig. 7, I dispense with the track-circle G of the old derrick and also the braces 0 c and, to swing the lever F, I place the swinging rope j, Fig. 9, 3' Fig. 7, through a pulley, j, and then attach it to the horses whiflletree M. I also extend the fork-rope h, Fig. 9, j", Fig. 7, through a pulley at the front end of the lever f, and thence down through pulleys j j to the whiffletree M. I attach the stay-rope h, Fig. 9, I, Fig. 7, firmly to the swiveled clevis and ring K, the roller K working upon the stay circle D and I substitute for braces e e the adjustable bracerods e a attached at the top by hooked bolts 1 and at the bottom to clevises c on the corners of the frame and adjusted in length by threaded links 6 With this improved construction, as the horse at M, Fig. 7, moves outward the fork n is raised to the desired height, then the swing-rope 3' is so attached that it will begin 2 worms to draw on the back end of the lever, and thus swing the fork and other end of the lever over the stack, and when near the top of the stack it will raise the fork end of the lever to any desired height as it reaches the stack. The lower ends of the bracerods e" 6 being attached at the corners c 0, give the lever a greater side swing than the old derrick, and when the stay-circle is placed on the other side of the standard B the brace-rods e c are changed from a to 0 thus making the entire derrick reversible.

The cross-pieces I) b, Fig. 9, I) b", Fig. 7, are placed upon and bolted to the pieces a a, Fig. 9, a a a, Fig. 7, which are made with rounded or slanted ends (f, to facilitate moving the machine from place to place. v

Having thus described the use and construction of my improved derrick, what I claim as new, and desire to secure by Letters Patent, is

1. In a lever-derrick, the lever F, having cap A, extended pivot-pin 25, guy-rods D I) g, and supports 13 B all substantially as shown and described, for the purposes set forth.

2. In a lever derrick, the combination of ropes j, 3' and I, with a lever, F, and staycircle I)", all substantially as shown and described.

3. The combination of a pivoted lever, F, supported upon a standard, B, and ropes j 9' I, and swiveled clevis K, and stay-circle D all substantially as and for the purpose set forth.

4. A leverderrick having a braced and bridged lever, F, with ropes j", 3' and I, swiveled clevis K, and stay-circle D upon a standard, B, braced to and supported by a frame, all substantially as shown and described, for the purpose set forth.

I11 testimony whereof I afiix my signature in presence of two witnesses.

OBED H. MITCHELL.

W'itu esses:

HENRY O. YOUNG, N. M. TREAT. 

